When does the Assignment status of learner change from Waitlisted to Pending Seat Acceptance

For an offering with a learner on waitlisted status, the capacity of the offering when increased, we were expecting the Assignment status of the learner to move from Waitlisted to Pending Seat Acceptance status. But the status remains as Waitlisted.

When does this Assignment status change reflect for the learner? Do we have to run any Scheduled processes?